摘要:
insert增加 update 更新 update user set age=23 where name='zhang san'; update user set age=age+1 where id=3; delete 删除 delete from user where age=23; delet 阅读全文
摘要:
数据准备: 用户表 user: create table user(id int unsigned primary key not null auto_increment, name varchar(50) UNIQUE not null, age tinyint not null, sex enu 阅读全文